Laminated inductor

ABSTRACT

A laminated inductor includes a component body that provides a mounting surface on one of its faces, and at least a pair of external electrodes are formed on the mounting surface, wherein the component body has a laminate constituted by multiple insulator layers, a spiral coil conductor formed in the laminate, and leader parts that electrically connect the coil conductor and external electrodes; the coil conductor comprises conductor patterns formed in the insulator layers and via hole conductors that penetrate through the insulator layers and electrically connect the multiple conductor patterns, and also has a coil axis running roughly in parallel with the mounting surface and a turn unit having one or more sides running roughly in parallel with the mounting surface; and the via hole conductors are formed only on the side farthest away from the mounting surface among the one or more sides.

FIELD OF THE INVENTION

The present invention relates to a laminated inductor.

DESCRIPTION OF THE RELATED ART

Laminated inductors have been manufactured by means of combining, forexample, multiple conductor patterns obtained from multiple screenmasks, or multiple conductor patterns obtained by shifting identicalscreen masks. In recent years, high-frequency inductors are required todemonstrate narrow tolerance characteristics as well as improvedcharacteristics at high frequencies.

According to Patent Literature 1, a coil conductor whose rectangularsolid component body provides a mounting surface on one of its faces andwhich has a center axis running in parallel with the mounting surface,is formed in a laminate constituted by insulator layers. The coilconductor is constituted by coil patterns formed in the laminate, andvia hole conductors that conduct two or more of the coil patterns. Thevia hole conductors are formed in both the region near the mountingsurface and region far from the mounting surface.

BACKGROUND ART LITERATURES [Patent Literature 1] Japanese PatentLaid-open No. 2000-348939 SUMMARY

According to the constitution described in Patent Literature 1, the viahole conductors in the region near the mounting surface are positionedclose to and in parallel with the external electrodes. This constitutionis subject to generation of stray capacitance and consequent drop inhigh-frequency characteristics, especially Q characteristics. An objectof the present invention is to provide a laminated inductor of smallerstray capacitance and high Q.

After studying in earnest, the inventors completed the present inventiondescribed below.

The laminated inductor proposed by the present invention has a componentbody that provides a mounting surface on one of its faces, and at leasta pair of external electrodes formed on the surface of the mountingsurface. The component body has a laminate constituted by multipleinsulator layers, a spiral coil conductor formed in the laminate, andleader parts that conduct the coil conductor and external electrodes.The coil conductor comprises conductor patterns formed in the insulatorlayers, and via hole conductors that penetrate through the insulatorlayers and electrically connect the multiple conductor patterns. Thecoil conductor has a coil axis running roughly in parallel with themounting surface, and a turn unit whose one or more sides are runningroughly in parallel with the mounting surface. The via hole conductorsare formed only on the side farthest away from the mounting surfaceamong the one or more sides running roughly in parallel with themounting surface. To be more specific, if there is only one side runningroughly in parallel with the mounting surface, then the via holeconductors are formed only on this one side; if there are multiple sidesrunning roughly in parallel with the mounting surface, then the via holeconductors are formed only on the side farthest away from the mountingsurface among these sides.

The conductor pattern is a polygon having three or more apexes, orpreferably it comprises a combination of a C-shaped pattern of roughlyrectangular shape that has four apexes and a part of one side missingand a bar-shaped pattern of roughly linear shape, where the bar-shapedpattern is longer than the length of the missing part of the C-shapedpattern. Preferably the bar-shaped pattern constitutes at least a partof the side farthest away from the mounting surface. Separately, it ispreferred that a pair of external electrodes are formed on the mountingsurface by sandwiching the insulation region and at least some via holeconductors are formed in such a way that their vertically projectedshapes on the mounting surface are positioned in the insulation region.Also separately, it is preferred that a pair of external electrodes areformed on the mounting surface and the maximum distance between twopoints of the vertically projected shapes of all via hole conductors onthe mounting surface is shorter than the interval between the pair ofexternal electrodes. According to a favorable embodiment, the laminatedinductor is constituted in such a way that the center axis of the coilconductor passes farther away from the mounting surface than the planerunning in parallel with the mounting surface, and also passes themidpoint between the mounting surface and the farthest part of thecomponent body from the mounting surface. Preferably the verticallyprojected shapes of the leader parts on the mounting surface arepositioned on the outer side of the vertically projected shape of thecoil conductor on the mounting surface. The external electrodes are notlimited to the mounting surface and preferably they are formed over asection of at least one face of the component body adjoining themounting surface.

According to the present invention, the stray capacitance between theexternal electrodes and coil conductor can be reduced by the longerdistances between the external electrodes and via hole conductors, whichin turn improves the high-frequency characteristics, especially Qcharacteristics. In addition, any negative effect that may result fromthe shifting of via hole conductors can be mitigated because all viahole conductors are provided on one side, and this allows the coil size,such as coil diameter, to be increased relative to the size of thecomponent body. Combined use of the C-shaped pattern and bar-shapedpattern increases the dimensional stability of the coil conductor andallows the tolerance for inductance to be narrowed, and also requiresfewer print screens to reduce the manufacturing cost. Preferably thecenter axis of the coil conductor is positioned far from the mountingsurface so that the stray capacitance between the external electrodesand coil conductor can be reduced further, while in another favorableembodiment the height of the laminated inductor can be reduced.

Any discussion of problems and solutions involved in the related art hasbeen included in this disclosure solely for the purposes of providing acontext for the present invention, and should not be taken as anadmission that any or all of the discussion were known at the time theinvention was made.

For purposes of summarizing aspects of the invention and the advantagesachieved over the related art, certain objects and advantages of theinvention are described in this disclosure. Of course, it is to beunderstood that not necessarily all such objects or advantages may beachieved in accordance with any particular embodiment of the invention.Thus, for example, those skilled in the art will recognize that theinvention may be embodied or carried out in a manner that achieves oroptimizes one advantage or group of advantages as taught herein withoutnecessarily achieving other objects or advantages as may be taught orsuggested herein.

Further aspects, features and advantages of this invention will becomeapparent from the detailed description which follows.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other features of this invention will now be described withreference to the drawings of preferred embodiments which are intended toillustrate and not to limit the invention. The drawings are greatlysimplified for illustrative purposes and are not necessarily to scale.

FIG. 1 is a schematic oblique perspective view of an example of alaminated inductor conforming to the present invention.

FIG. 2 is a drawing explaining the a C-shaped pattern and bar-shapedpattern.

FIG. 3 is a schematic section view of a laminated inductor conforming tothe present invention.

FIG. 4 is a drawing explaining another C-shaped pattern and bar-shapedpattern.

DESCRIPTION OF THE SYMBOLS

1: Laminated inductor, 11, 12: External electrode, 13: Insulationregion, 14: Mounting surface, 15: 20: Opposing surface, b1: Planepassing the center between a mounting surface and an opposing surface,b2: Center axis of a coil conductor, Component body, 21: Laminate, 22:Via hole conductor, 23: Via hole conductor, 24: Leader part, 221:C-shaped pattern, 222: bar-shaped pattern.

DETAILED DESCRIPTION OF EMBODIMENTS

The present invention is described in detail below by referring to thedrawings as deemed appropriate. Note, however, that the presentinvention is not limited to the embodiments illustrated, and that,because characteristic parts of the invention may be emphasized in thedrawings, the scale of each part of the drawings is not always accurate.

FIG. 1 is a schematic oblique perspective view of an example of alaminated inductor conforming to the present invention.

The laminated inductor 1 conforming to the present invention has acomponent body 20 and external electrodes 11, 12 formed on the surfaceof the component body 20. The external electrodes 11, 12 are electrodesexposed on the exterior surface of the laminated inductor 1, and thecomponent body 20 constitutes a structure of the laminated inductorother than the external electrodes. The laminated inductor 1 provides amounting surface on one of its faces. The mounting surface is intendedto contact the substrate or other object on which the component ismounted. According to the embodiment of FIG. 1, the bottom faceaccording to the orientation of the figure is the mounting surface. Inthe text below, vertical relationships may be described by assumingthat, with respect to the position relationship of the mounting surfaceand component body 20, the mounting surface is set on the “bottom side.”The external electrodes 11, 12 are formed at least on the mountingsurface. Normally a pair of external electrodes 11, 12 is formed on themounting surface with a specified distance in between, and an insulationregion 13 which constitutes a part of the component body 20 is presentbetween the two external electrodes 11, 12. The external electrodes 11,12 may be formed not only on the mounting surface, but also over asection of at least one face of the component body 20 adjoining themounting surface. FIG. 3 is a schematic section view of a laminatedinductor conforming to the present invention. As shown in the embodimentof FIG. 3, the external electrodes 11, 12 may extend from the mountingsurface to one side face to three side faces connecting the mountingsurface 14.

Returning to FIG. 1, the component body 20 has a laminate 21 constitutedby insulator layers, a coil conductor (22, 23) formed in the laminate21, and leader parts 24. The leader parts 24 electrically connect thecoil conductor and external electrodes 11, 12, respectively. The coilconductor comprises conductor patterns 22 and via hole conductors 23.The conductor patterns 22 are normally formed on one face of theinsulator layers. The via hole conductors 23 penetrate through theinsulator layers and electrically connect the multiple conductorpatterns 22 formed on different insulator layers.

Preferably the conductor pattern 22 comprises a combination of aC-shaped pattern and bar-shaped pattern. FIG. 2 is a drawing explainingthe C-shaped pattern and bar-shaped pattern. A C-shaped pattern 221 is apolygonal conductor pattern having three or more apexes. Arepresentative example is a pattern of roughly rectangular shape thathas four apexes, where a part of one side of the roughly rectangularshape is missing. The roughly rectangular shape is not limited to therectangular shape shown in FIG. 2, but it also includes an ellipticalshape (as shown in FIG. 4) or other shape close to rectangle. TheC-shaped pattern 221 of roughly rectangular shape having four axesincludes a pattern having four apexes as shown in FIG. 2, and a patternthat has no clear apexes defining a roughly rectangular shape but hasparts that may be recognized as apexes defining a shape close torectangle. The dotted lines in FIG. 2 indicate positions where via holeconductors 23 (via hole conductors 23′ in FIG. 4) are formed.

A bar-shaped pattern 222 fills in a missing part on one side of theC-shaped pattern 221 of roughly rectangular shape. The bar-shapedpattern 222 may be linear, as shown in FIG. 2, or it may be a curvedline as shown in FIG. 4 (the bar-shaped pattern 222′) that constitutes apart of an elliptical shape, according to the actual roughly rectangularshape. Combined use of the C-shaped pattern 221 (the C-shaped pattern221′ in FIG. 4) and bar-shaped pattern 222 (the bar-shaped pattern 222′in FIG. 4) increases the dimensional stability of the coil conductor andallows the tolerance for inductance to be narrowed, and also requiresfewer print screens to reduce the manufacturing cost. Preferably thelength of the bar-shaped pattern 222/222′ is greater than the length ofthe missing part of the C-shaped pattern 221/221′, as this achieves morereliable electrical connection.

The coil conductor 22, 23 is spiral or helical in shape, and has aspecified turn unit as well as a coil axis running roughly at rightangles to the plane specified by the turn unit. The coil axis passingthe center of the plane specified by the turn unit of the coil conductoris defined as the center axis of the coil conductor. Under the presentinvention, the coil axis is parallel with the mounting surface.Preferably the turn unit is mainly specified by the conductor patterns22.

Preferably the coil axis of the coil conductor is positioned above thecenter of the component body 20. To be more specific, first a planerunning in parallel with the mounting surface and also passing themidpoint between the mounting surface and the farthest part of thecomponent body 20 from the mounting surface is specified. Then,preferably the laminated inductor is constituted in such a way that thecoil axis of the coil conductor passes above this parallel plane, orspecifically farther away from the mounting surface. To be specific,preferably dimension b in the embodiment of FIG. 3 is not zero. Thisway, the stray capacitance between the external electrodes 11, 12 andcoil conductor 22, 23 can be reduced further.

The spiral shape formed by the coil conductor 22, 23 may be, forexample, a structure where a turn unit of roughly rectangular shaperepeats itself while moving in translational motion along the coil axis,where the turn unit is not limited to a rough rectangle, but it alsoincludes a rough ellipse or shape combining rectangle and ellipse. Theturn unit has at least one side, or preferably two or more sides,running roughly in parallel with the mounting surface.

Under the present invention, the via hole conductors 23 are formed onlyon the side farther away from (above) the mounting surface, among theone or more sides running roughly in parallel with the mounting surface.To be more specific, if there is only one side running roughly inparallel with the mounting surface, then the via hole conductors areformed only on this one side; if there are multiple sides runningroughly in parallel with the mounting surface, then the via holeconductors are formed only on the side farthest away from the mountingsurface among these sides. If the C-shaped pattern and bar-shapedpattern are present, as mentioned above, preferably the bar-shapedpattern constitutes at least a part of the “side running roughly inparallel with the mounting surface and also farthest away from themounting surface.” According to this constitution, the distances betweenthe external electrodes 11, 12 and vial hole conductors 23 becomegreater. As a result, the stray capacitance between the externalelectrodes 11, 12 and coil conductor can be reduced, which in turnimproves the high-frequency characteristics, especially Qcharacteristics. In addition, any negative effect that may result fromthe shifting of via hole conductors 23 can be mitigated because all viahole conductors 23 are provided on one side, and this allows the coilsize, such as coil diameter, to be increased relative to the size of thecomponent body 20.

Here, projected shapes of the via hole conductors 23 and leader parts 24on the mounting surface are assumed. These projected shapes are thoseobtained by projecting the via hole conductors 23 and leader parts 24vertically onto the mounting surface. According to a favorableembodiment of the present invention, a pair of external electrodes 11,12 are formed on the mounting surface by sandwiching an insulationregion 13, where at least some via hole conductors 23 are formed in sucha way that their vertically projected shapes on the mounting surface arepositioned in the insulation region 13. Simply put, the verticallyprojected shapes of via hole conductors 23 are placed inside the pair ofexternal electrodes 11, 12. In the embodiments of FIGS. 1 and 3, forexample, the vertically projected shapes of via hole conductors 23 areplaced inside the external electrodes 11, 12. This way, the straycapacitance between the external electrodes 11, 12 and via holeconductors 23 can be reduced.

According to another favorable embodiment of the present invention, thepair of external electrodes 11, 12 are formed on the mounting surfaceand all via hole conductors 23 are formed in such a way that the maximumdistance between two points of the vertically projected shapes of viahole conductors 23 on the mounting surface becomes shorter than theinterval between the pair of external electrodes 11, 12. This way, notonly high Q characteristics can be achieved, but the tolerance forinductance can also be narrowed due to the dimensional stability of thecoil conductor.

According to yet another favorable embodiment, the laminated inductor isconstituted in such a way that the vertically projected shapes of theleader parts 24 on the mounting surface are positioned on the outer sideof the vertically projected shape of the coil conductor on the mountingsurface. Here, “outer side” means closer to the end when the center ofthe component body 20 is used as the reference. This way, the leaderparts 24 do not lessen the coil diameter and therefore drop ininductance, or other adverse change can be suppressed.

A laminated inductor according to the present invention can bemanufactured based on the aforementioned structure by applying anysuitable conventional methods as deemed appropriate. An example ofmanufacturing such laminated inductor is explained, but it should benoted that the manufacturing method is not at all limited to thisexample. First, multiple green sheets made of insulating material areprepared. These green sheets are each formed by applying onto a filmusing the doctor blade method, etc., a slurry made of insulatingmaterial whose primary ingredient is glass, etc. Here, the insulatingmaterial may be one whose primary ingredient is glass, or dielectricceramics, ferrite, soft magnetic alloy material, or resin or othermaterial into which insulating material is mixed. Through holes areformed by means of laser processing, etc., at specified positions on thegreen sheets, or specifically the positions where via hole conductors 23will be formed. Then, a conductive paste prepared as a precursor ofconductor pattern 22 is printed by means of screen masking, etc., at thespecified positions on the green sheets, respectively. The primaryingredient of this conductive paste may be silver, copper or othermetal, for example.

Next, the green sheets are laminated in a specified order and thenpressure is applied in a laminating direction to pressure-bond the greensheets. Then, the pressure-bonded green sheets made of insulatingmaterial are cut in units of chips, after which each chip is sintered ata specified temperature (such as 800° C. to 900° C. or so) to form acomponent body 20. Next, external electrodes 11, 12 are formed atspecified positions on the mounting surface of each such component body20. A laminated inductor is now formed. The external electrodes 11, 12are formed by applying an electrode paste whose primary ingredient issilver, copper, etc., and then baking the electrode paste at thespecified temperature (such as 680° C. to 900° C. or so), followed byelectroplating, etc. Cu, Ni, Sn, etc., may be used for thiselectroplating. The laminated inductor is completed through the stepsdescribed above.

EXAMPLES

Examples are given to explain the present invention in greater detail.Note, however, that the examples below do not limit the scope of thepresent invention in any way.

Borosilicic acid glass powder of dielectric constant 5 and carbon blackwere dispersed in alcohol together with binder to obtain a slurry. Thisslurry was applied onto a PET film using the doctor blade method whilebeing dried at the same time, to obtain a green sheet. The green sheetwas cut and a specified number of through holes of 50 μm in diameterwere made by YAG laser in each cut sheet. The positions of through holesare specified below (also refer to FIG. 3). An ink constituted bysilver, binder, and organic solvent was used to screen-print a conductorpattern 22 according to the through holes. The conductor pattern 22 hada rectangular shape with a long side of 0.350 mm, short side of 0.150mm, and line width of 0.05 mm, comprising a C-shaped pattern 221 andbar-shaped pattern (not illustrated). As for the C-shaped pattern, athrough hole for via hole conductor was provided at a positioncorresponding to dimension a and another at a position corresponding todimension a′ in FIG. 3, and the pattern was extended by 0.025 mm beyondeach of these positions to obtain a rectangular structure whose one sidehas a missing part near the center. The bar-shaped pattern wasconstituted as a straight line pattern that is 0.1 mm longer than thelength of the missing part of the C-shaped pattern. Sheets having aconductor pattern 22 (C-shaped pattern or bar-shaped pattern) and thoseon which no pattern was printed were stacked on top of one another andcompressed with a pressure of 100 kgf/cm² at a temperature of 100° C.into one piece. The obtained bar was cut with a dicing blade and eachcut piece was sintered for 1 hour at 900° C. to obtain a base. The sameink used for conductor patterns 22 was printed on the leader electrodesurfaces of the obtained base, after which the ink was sintered for 1hour at 700° C. to obtain external electrodes 11, 12. Thereafter, theexternal electrodes 11, 12 were plated with nickel and tin using thebarrel plating method to obtain a finished product. The finished producthad a dimension of 0.580 mm in a length (L) direction, 0.03 mm in awidth (W) direction, and 0.300 mm in a height (T) direction, and thewidth of the external electrode was 0.150 mm.

To explain the dimensions shown in FIG. 3, (a, a′, b, c), a and a′indicate the positions where via hole conductors 23 are formed, bindicates the level of upward deviation of the center axis b2 of thecoil conductor from the plane b1 passing the center between the mountingsurface 14 and opposing surface 15 of the component body 20, and cindicates the spreading height of the external electrodes 11, 12. Thesedimensions were measured by polishing the obtained laminated inductor 1and then observing its section using a magnifying glass. The laminatedinductor was constituted in such a way that the leader parts 24 would bepositioned 0.025 mm outside of the coil conductor 22, 23 in thecomponent body.

The manufacturing conditions used in each of the examples andcomparative examples are as follows:

-   -   Example 1: a=150 μm, a′=150 μm, b=0, c=0    -   Example 2: a=200 μm, a′=200 μm, b=0, c=0    -   Example 3: a=250 μm, a′=250 μm, b=0, c=0    -   Example 4: a=250 μm, a′=250 μm, b=0, c=150 μm    -   Example 5: a=250 μm, a′=250 μm, b=50 μm, c=0    -   Comparative Example 1: a=150 μm, a′=150 μm, b=0, c=0    -   Comparative Example 2: a=150 μm, a′=150 μm, b=0, c=0

Note that, in Examples 1 to 5, via hole conductors 23 were formed onlyon the side farther away from the mounting surface between the two sidesof the conductor pattern 22 running in parallel with the mountingsurface, as shown in FIG. 3. In Comparative Example 1, on the otherhand, via hole conductors 23 were formed on both sides of the conductorpattern 22 running in parallel with the mounting surface, which isdifferent from what is expressed in FIG. 3. To be more specific, thesheets were laminated in such a way that the cutouts in their C-shapedpatterns 221 would alternate in orientation in the vertical direction,to allow via hole conductors 23 to be formed alternately on the side farfrom the mounting surface and side near the mounting surface. InComparative Example 2, via hole conductors 23 were formed only on theside near the mounting surface between the two sides of the conductorpattern 22 running in parallel with the mounting surface, which isdifferent from what is expressed in FIG. 3.

The laminated inductors obtained by these examples and comparativeexamples were measured for Q before and after mounting, using animpedance analyzer (E4991A by Agilent) and at an inductance of 4.7 nHand measurement frequency of 1.8 GHz. The measured results are asfollows:

In Example 1, Q was 46 before mounting and 46 after mounting.

In Example 2, Q was 47 before mounting and 46 after mounting.

In Example 3, Q was 47 before mounting and 46 after mounting.

In Example 4, Q was 46 before mounting and 46 after mounting.

In Example 5, Q was 48 before mounting and 48 after mounting.

In Comparative Example 1, Q was 40 before mounting and 39 aftermounting.

In Comparative Example 2, Q was 38 before mounting and 36 aftermounting.

In the present disclosure where conditions and/or structures are notspecified, a skilled artisan in the art can readily provide suchconditions and/or structures, in view of the present disclosure, as amatter of routine experimentation. Also, in the present disclosureincluding the examples described above, any ranges applied in someembodiments may include or exclude the lower and/or upper endpoints, andany values of variables indicated may refer to precise values orapproximate values and include equivalents, and may refer to average,median, representative, majority, etc. in some embodiments. Further, inthis disclosure, an article “a” or “an” may refer to a species or agenus including multiple species, and “the invention” or “the presentinvention” may refer to at least one of the embodiments or aspectsexplicitly, necessarily, or inherently disclosed herein. In thisdisclosure, any defined meanings do not necessarily exclude ordinary andcustomary meanings in some embodiments.

The present application claims priority to Japanese Patent ApplicationNo. 2012-261733, filed Nov. 29, 2012, the disclosure of which isincorporated herein by reference in its entirety.

It will be understood by those of skill in the art that numerous andvarious modifications can be made without departing from the spirit ofthe present invention. Therefore, it should be clearly understood thatthe forms of the present invention are illustrative only and are notintended to limit the scope of the present invention.

We claim:
 1. A laminated inductor having a component body that providesa mounting surface on one face of the component body, and at least apair of external electrodes formed on the mounting surface, wherein: thecomponent body has a laminate constituted by multiple insulator layers,a spiral coil conductor formed in the laminate, and leader parts thatelectrically connect the coil conductor and the external electrodes,respectively; the coil conductor comprises multiple conductor patternsformed in the insulator layers and via hole conductors that penetratethrough the insulator layers and electrically connect the multipleconductor patterns in a direction parallel to the mounting surface,constituting turn units, wherein a coil axis runs roughly in parallelwith the mounting surface and roughly perpendicularly to the turn units,said turn units having sides roughly in parallel with and perpendicularto the mounting surface, respectively; and all of the via holeconductors are formed only on a side one of the sides of the turn units,which is farthest away from the mounting surface among the sides of theturn units, wherein the conductor pattern comprises a combination of aC-shaped pattern constituted by a polygonal shape having three or moreapexes and having a part of one side missing, and a bar-shaped patternconstituted by (i) a roughly straight line shape when the C-shapedpattern is a roughly polygonal pattern having three or more apexes andhaving a part of one side missing, or (ii) a curved line thatconstitutes a part of an elliptical shape when the bar-shaped patternand the C-shaped pattern constitute the elliptical shape, the bar-shapedpattern is longer than a length of the missing part of the C-shapedpattern, and the bar-shaped pattern constitutes at least a part of theside farthest away from the mounting surface.
 2. A laminated inductoraccording to claim 1, wherein the pair of external electrodes are formedon the mounting surface apart from each other via an insulation region,where at least some via hole conductors are formed such that theirvertically projected shapes on the mounting surface are positionedwithin the insulation region.
 3. A laminated inductor according to claim1, wherein the pair of external electrodes are formed on the mountingsurface and a maximum distance between two points of verticallyprojected shapes of all via hole conductors per turn unit on themounting surface is shorter than an interval between the pair ofexternal electrodes.
 4. A laminated inductor according to claim 1,wherein the laminated inductor is constituted wherein a center axis ofthe coil conductor passes farther away from the mounting surface than aplane running in parallel with the mounting surface and passing amidpoint between the mounting surface and the farthest part of thecomponent body from the mounting surface.
 5. A laminated inductoraccording to claim 1, wherein the laminated inductor is constituted suchthat vertically projected shapes of the leader parts on the mountingsurface are positioned on an outer side of a vertically projected shapeof the coil conductor on the mounting surface.
 6. A laminated inductoraccording to claim 1, wherein the external electrodes are formed on themounting surface and also over a section of at least one face of thecomponent body connecting the mounting surface.
 7. A laminated inductoraccording to claim 2, wherein the external electrodes are formed on themounting surface and also over a section of at least one face of thecomponent body connecting the mounting surface.
 8. A laminated inductoraccording to claim 3, wherein the external electrodes are formed on themounting surface and also over a section of at least one face of thecomponent body connecting the mounting surface.
 9. A laminated inductoraccording to claim 4, wherein the external electrodes are formed on themounting surface and also over a section of at least one face of thecomponent body connecting the mounting surface.
 10. A laminated inductoraccording to claim 5, wherein the external electrodes are formed on themounting surface and also over a section of at least one face of thecomponent body connecting the mounting surface.